GEN000000-LNX00360 - The X server must have the correct options enabled - ':0 /usr/bin/X:0'
Without the correct options enabled, the Xwindows system would be less secure and there would be no screen timeout.
Enable the following options: -audit (at level 4), -auth and -s with 15 minutes as the timeout value. Procedure for gdm: Edit /etc/gdm/custom.conf and add the following: [server-Standard] name=Standard server command=/usr/bin/Xorg -br -audit 4 -s 15 chooser=false handled=true flexible=true priority=0 Procedure for xinit: Edit or create a .xserverrc file in the users home directory containing the startup script for xinit. This script must have an exec line with at least these options: exec /usr/bin/X -audit 4 -s 15 -auth <Xauth file> & The <Xauth file> is created using the 'xauth' command and is customarily located in the users home directory with the name '.Xauthority'.